Hotrox Electric Hand Warmer 5 "Mama's little helper" Lynda 15 January 2018 I bought this for my husband who has Reynaulds syndrome. His fingers go so white and dead looking he cannot feel them and could do himself serious damage. This little gadget is a God send. Small enough to slip inside gloves and the heat is controllable unlike the little crystal packs with a metal disc. It lasts for hours and would be good for sports spectators, walkers etc. Got to buy some more for other members of the family as this condition is genetic.